Haidensen riyō hansō denwa
Subtitle: Hansō hen
By: [henchosha Jitsuyō Tsūshin Kōgaku Sōsho Iinkai]
Edition: 3-han
Publisher: Denki Tsūshin Gakkai
Published: 1947
Place of publication: Tōkyō
Language: jpn
Number of pages: 88
Subjects: Rural telephone